a anbny . >> president obama addressed the nation calling the deadly explosion. he made it clear the information is still coming in and all of factor still not yet known. the president made clear those responsible will be identified and held accountable. >> we still do not know who did this or why. people should not jump to conclusions before we have all the facts. >> but, make no mistake we will get to the bottom of this and we will find out who did this, when will find out why they did this. any responsible individuals, and irresponsible groups will feel the full weight of justice. >> the explosions happened in copley square about 50 to 100 yds apart. the fbi has taken over and is the lead in this investigation. >> a pakistan in taliban denied any role in the boston explosion. >> the crew spokesman denied involvement in a telephone call with the associated press. the main focus of the pakistan a taliban has been an insurgency against the pakistan government because of its alliance with the united states to enforce islamic law in the country. but the group is th